Siemens Gigaset S685 IP Manual page 258

Glossary
MRU
Maximum Receive Unit
Defines the maximum user data volume within a data packet.
MTU
Maximum Transmission Unit
Defines the maximum length of a data packet that can be carried over the net-
work at a time.
Music on hold
Music that is played while you are on a
The waiting participant hears music while on hold.
N
NAT
Network Address Translation
Method for converting (private)
IP addresses. NAT enables the IP addresses of
(e.g. VoIP telephones) in a
for the Router
VoIP telephones behind a NAT router cannot be reached by VoIP servers (on
account of the private IP address). In order to "get around" NAT, it is possible to
use (alternatively)
VoIP provider to use an
If an outbound proxy is made available you must allow for this in the VoIP set-
tings for your phone.
Group of devices. Devices can be connected in either wired or wireless mode.
Network
Networks can also differ in range and structure:
– Range: local networks (LAN) or wide-area networks (WAN)
– Structure:
Network subscriber
Devices and PCs that are connected to each other in a network, e.g. servers, PCs
and phones.
O
Outbound proxy
Alternative NAT control mechanism to STUN and ALG.
Outbound proxies are implemented by the VoIP provider in firewall/NAT envi-
ronments as an alternative to
through the firewall.
Outbound proxy and STUN servers should not be used simultaneously.
See also: STUNand NAT.
256
IP addresses
LAN to be concealed behind a shared IP address
on the Internet.
ALG in the router,
Outbound
Infrastructure network
SIP proxy
Consultation call
to one or more (public)
Network subscribers
STUN in the VoIP telephone, or for the
proxy.
or ad-hoc network
server. They control data traffic
or Call swapping.